Volume 62, Issue 1, January 2011, Pages 71-80
I. M. El-Hifny; Sh. B. D. Yousef
Volume 61, Issue 4, October 2010, Pages 406-414
M. A. El-Khateeb; A. S. El-Leithy; M. M. Farahat; K. I. Hashish
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